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996 Cylinder head removal question

johnmh
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johnmh Member

johnmh

Posted
Posted

Hi, I am taking my heads off my 3.4 to get them checked and at least one crack welded. 

 

To remove the head on 1-3,  I set the crank at TDC cylinder 1 and remove the head. Easy. I can use zip ties and paint marks to check the timing does not change. 

 

To then remove the 4-6 head, I assume the crank can stay at TDC cylinder 1? I do not need to rotate it 360 degrees to set cylinder 4 at TDC? To do so would be difficult, as the cam chain and gear which bolts to the 1-3 exhaust cam would need to turn (difficult with the 1-3 chain zip tied in place on the exhaust cam sprocket). 

 

The Bentley manual is unclear on this point. 

Carlvs Member

Carlvs

Posted
Posted

When I rebuilt my motor last year to have a crack on bank two repaired I do not recall turning the motor over again. It’s a different story altogether when you go back and reassemble everything. I sent my cylinder heads to Hoffman at Hammer Heads in Georgia and was very pleased with the quality of work that he did.


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Carlvs Member

Carlvs

Posted
Posted

I did mark the scavenge pumps prior to removal. Be sure to replace the guide rail plastic sliders for the cam chain and Vario tensioners.

 

 

Sent from my iPad using Tapatalk

 

johnmh Member

johnmh

Posted
  • Author
Posted

Thanks, I had done that job about a year ago last time the engine was out.  Those sliders were really worn. 

 

I got the 1-3 bank head off this evening (no obvious cracks), 4-6 will come off tomorrow (which is full of crud, so I suspect I will find a crack there).  Then to find some quality packing materials...  Hoffman will get my heads too. 

Carlvs Member

Carlvs

Posted
Posted

I posted my rebuild on Rennlist at 

6554b6be8c0d829a8bf63ae0c82cf121_link.pn New to me 996 with coolant intermix issue - Rennlist - Porsche Discussion Forums

RENNLIST.COM
996 Forum - New to me 996 with coolant intermix issue - Hello there, I just acquired a 99 996 Cabriolet with a oil in the coolant and oil intermix issue. PO had replaced the oil cooler hoping that it would cure the issue but sadly it did not. Suspect a cracked head and wondered what other things should be...

 

 

There seems to be a many more posters there along with feedback. Have you tried that site?

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